The Hidden Cost of Post-Harvest Losses — And What We Can Do About It

When we think of food insecurity or hunger, we often focus on how much food we produce. But a lesser-known crisis happens after the harvest: a staggering amount of food is lost during storage, transportation, and processing—before it ever reaches a plate. This crisis refers to post-harvest storage loss, and has deep economic, health, and environmental consequences. 

Postharvest losses

Globally, up to 30% of food produced is lost or wasted after harvest. In developing countries, much of this loss occurs at the post-harvest level—during drying, storage, handling, and transport. The FAO estimates that post-harvest losses of grains alone can reach 20–40% in some regions of Sub-Saharan Africa and South Asia. These losses represent billions of dollars in missed income for smallholder farmers, whose livelihoods depend on every kilogram of grain. But the ripple effects go far beyond the farm, contributing to economic, environmental, and health challenges locally, nationally, and globally. 

The Economic Impact

Post-harvest losses cost the global economy an estimated $1 trillion annually in lost food and productivity. Smallholder farmers, who produce over 70% of food in Africa and Asia, are disproportionately affected, losing both income and food security. Postharvest losses do not just affect farmers – national economies suffer as well, losing value-added potential from trade, processing, and exports.

The Environmental Impact

While food security and income is an urgent issue, post-harvest losses generate considerable negative environmental impacts. When food is damaged or lost during post-harvest storage, it is the equivalent of throwing away the resources used to produce that crop, resulting in food production with higher emissions from fertilizer, land use, and agricultural inputs. According to the World Resources Institute, food loss and waste account for 8–10% of global greenhouse gas emissions—making it one of the biggest climate problems we rarely hear about.

The Health Impacts

Another hidden cost of poor post-harvest storage is contamination by aflatoxins. Aflatoxins are naturally occurring toxins produced by molds that thrive in warm, humid conditions, especially in improperly stored grains like maize and groundnuts. Aflatoxins are carcinogenic and can cause acute poisoning, liver cancer, immune suppression, and stunted growth in children. In many countries, they are a leading cause of food rejection in international trade, especially in maize and nuts. The economic cost of aflatoxins is estimated at $1.2 billion per year in lost trade and health burdens across Africa alone.

What Can We Do About It?

The good news? Post-harvest losses are preventable. And the solutions are surprisingly accessible.

1. Promote Hermetic Storage Technologies

Hermetic storage is one of the most effective and affordable ways to tackle post-harvest loss. Technologies like PICS bags (Purdue Improved Crop Storage) use a triple-layer design to create airtight, pest-proof environments that:

• Prevent insect damage without chemicals
• Reduce moisture buildup that can lead to mold
• Keep grain fresh and marketable for months

PICS bags are used widely in Africa and now expanding into Latin America and India, making strides to reduce postharvest losses. 

2. Invest in Farmer Training and Awareness

Simple interventions like teaching farmers how to dry, sort, and store grains correctly can dramatically reduce losses. These approaches are cost-effective and scalable—but require investment in rural extension and outreach.

3. Build Better Value Chains

Post-harvest losses often occur because farmers lack access to markets or infrastructure. Public-private partnerships and smart investment in storage, roads, and aggregation centers can close the gap between farm and fork.

Rethinking Food Security

Addressing food insecurity isn’t just about producing more food. It’s about protecting what we already grow. By reducing post-harvest losses, we can:

• Increase incomes for smallholder farmers
• Improve food safety and nutrition
• Reduce pressure on natural resources
• Cut greenhouse gas emissions

The cost of inaction is too high. But with the right tools, technology, and partnerships, we can turn this hidden crisis into an opportunity for resilience and sustainability.